package com.zhouyx.userservice.aspect;

import com.zhouyx.userservice.annotation.AutoFill;
import com.zhouyx.userservice.enums.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
import org.aspectj.lang.reflect.MethodSignature;


import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @title: AutoFillAspect
 * @Author: max.zhou1
 * @Date: 2024/9/4 21:45
 * @Version: 1.0
 **/
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切入点，切入点在com.sky.mapper.*.*(..)且有注解@AutoFill下的方法执行
    @Pointcut("execution(* com.zhouyx.userservice.mapper.*.*(..)) && @annotation(com.zhouyx.userservice.annotation.AutoFill)")
    public void autoFillPointCut(){}

    //前置通知，在通知中进行公共字段的赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始进行公共字段自动填充");

        //获取到当前被拦截的方法上的数据库操作类型（UPDATE/INSERT）
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库操作类型

        //获取到当前被拦截的方法的参数——实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0)
            return;
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = 1L; // test

        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT){
            //为四个公共字段赋值
            Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
            Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

            //通过反射为对象赋值
            setCreateTime.invoke(entity,now);
            setCreateUser.invoke(entity,currentId);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        }else if(operationType == OperationType.UPDATE){
            //为两个公共字段赋值
            Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
            //通过反射为对象赋值
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        }
    }
}

